Workshop 2: Mobile Hydraulics

This workshop is highly recommended for individuals involved with mobile machinery. Individuals dealing with equipment in agriculture, earthmoving, construction, utility equipment and manufacturing will benefit from this workshop.

It covers fundamental concepts as well as applications. Environmental concerns and the responsible use of energy are also reviewed. Hands-on training reinforces classroom instruction with opportunities to inspect, and reassemble various components. This class is necessary for advanced Troubleshooting and Electrohydraulics workshops. It is an excellent preparation for the International Fluid Power Society Certification Examinations for Hydraulic Specialist, Hydraulic Technician, or Hydraulic Mechanic.

Workshop Outline

Basic Hydraulic Principles

• Pascal’s Law
• Transmission of energy through fluids
• Force multiplication/motion control
• Symbols and circuits

Fluids in Mobile Environment

• Types of fluids and requirements
• Fire resistant and alternative fluids
• Fluid conditioning devices
• Filtration and fluid cleanliness
• Aeration, Cavitation, Contamination
  • How fluid properties are determined
  • Manual and automatic viscometer
  • Particle counters and fluid cleanliness testing
  • Testing for flash and fire points
  • Testing for cloud point and pour point
  • Pump durability and wear test

Reservoirs in Mobile vs. Stationary Equipment

• Types and functions of reservoirs
• Pressurized reservoirs

Pumps for Mobile Equipment

• Fixed displacement pumps:
  • Types/operations/hands-on disassembly
• Variable displacement pumps:
  • Types/operations/hands-on disassembly

Directional Control Valves in Mobile Equipment

• Basic types and operations
• Series and parallel circuits
• Multiple segment directional valves
• Modular valves: types and operations
• Proportional directional control
• Pilot operated directional control
• Hands-on assembly and disassembly

Cartridge Valves

• Functions and advantages
• Screw-in and Slip-in valves
• Proportional flow control

Pressure Control Valves in Mobile Equipment

• Types and operations
• Failure modes for pressure control

Flow Control Valves in Mobile Equipment

• Purpose and factors affecting flow control
• Types of flow control circuits

Actuators

• Types and characteristic of cylinders and motors
• Sizing based on force, torque/velocity
• Hands-on disassembly and reassembly

Accumulator

• Types and functions
• Effects of pre-charge, final pressure and temperature
• Accumulator sizing

Hydrostatic Transmission

• Basic concepts of closed-loop systems
• Types and functions of hydrostatic drives
• Cooling methods and reasons
• Problems associated with hydrostatics

Circuits Analysis for Mobile Hydraulic Systems

• Articulated front-end loader and bucket loader
• Drill rig, steering and braking circuits
• Aerial platform and excavator